Trends and regional distributions of land and ocean carbon sinks

Jorge Louis Sarmiento, M. Gloor, N. Gruber, C. Beaulieu, A. R. Jacobson, S. E.Mikaloff Fletcher, Stephen Wilson Pacala, K. Rodgers

Research output: Contribution to journalArticle

124 Citations (Scopus)

Abstract

We show here an updated estimate of the net land carbon sink (NLS) as a function of time from 1960 to 2007 calculated from the difference between fossil fuel emissions, the observed atmospheric growth rate, and the ocean uptake obtained by recent ocean model simulations forced with reanalysis wind stress and heat and water fluxes. Except for interannual variability, the net land carbon sink appears to have been relatively constant at a mean value of -0.27 Pg C yr-1 between 1960 and 1988, at which time it increased abruptly by -0.88 (-0.77 to -1.04) Pg C yr-1 to a new relatively constant mean of -1.15 Pg C yr-1 between 1989 and 2003/7 (the sign convention is negative out of the atmosphere). This result is detectable at the 99% level using a t-test. The land use source (LU) is relatively constant over this entire time interval. While the LU estimate is highly uncertain, this does imply that most of the change in the net land carbon sink must be due to an abrupt increase in the land sink, LS Combining double low line NLS - LU, in response to some as yet unknown combination of biogeochemical and climate forcing. A regional synthesis and assessment of the land carbon sources and sinks over the post 1988/1989 period reveals broad agreement that the Northern Hemisphere land is a major sink of atmospheric CO2, but there remain major discrepancies with regard to the sign and magnitude of the net flux to and from tropical land.

Original languageEnglish (US)
Pages (from-to)2351-2367
Number of pages17
JournalBiogeosciences
Volume7
Issue number8
DOIs
StatePublished - Aug 18 2010

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carbon sink
carbon sinks
oceans
ocean
land use
climate forcing
land
distribution
trend
fossil fuels
wind stress
fossil fuel
simulation models
Northern Hemisphere
heat
synthesis
atmosphere
carbon

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Earth-Surface Processes

Cite this

Sarmiento, J. L., Gloor, M., Gruber, N., Beaulieu, C., Jacobson, A. R., Fletcher, S. E. M., ... Rodgers, K. (2010). Trends and regional distributions of land and ocean carbon sinks. Biogeosciences, 7(8), 2351-2367. https://doi.org/10.5194/bg-7-2351-2010
Sarmiento, Jorge Louis ; Gloor, M. ; Gruber, N. ; Beaulieu, C. ; Jacobson, A. R. ; Fletcher, S. E.Mikaloff ; Pacala, Stephen Wilson ; Rodgers, K. / Trends and regional distributions of land and ocean carbon sinks. In: Biogeosciences. 2010 ; Vol. 7, No. 8. pp. 2351-2367.
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Sarmiento, JL, Gloor, M, Gruber, N, Beaulieu, C, Jacobson, AR, Fletcher, SEM, Pacala, SW & Rodgers, K 2010, 'Trends and regional distributions of land and ocean carbon sinks', Biogeosciences, vol. 7, no. 8, pp. 2351-2367. https://doi.org/10.5194/bg-7-2351-2010

Trends and regional distributions of land and ocean carbon sinks. / Sarmiento, Jorge Louis; Gloor, M.; Gruber, N.; Beaulieu, C.; Jacobson, A. R.; Fletcher, S. E.Mikaloff; Pacala, Stephen Wilson; Rodgers, K.

In: Biogeosciences, Vol. 7, No. 8, 18.08.2010, p. 2351-2367.

Research output: Contribution to journalArticle

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AU - Sarmiento, Jorge Louis

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AB - We show here an updated estimate of the net land carbon sink (NLS) as a function of time from 1960 to 2007 calculated from the difference between fossil fuel emissions, the observed atmospheric growth rate, and the ocean uptake obtained by recent ocean model simulations forced with reanalysis wind stress and heat and water fluxes. Except for interannual variability, the net land carbon sink appears to have been relatively constant at a mean value of -0.27 Pg C yr-1 between 1960 and 1988, at which time it increased abruptly by -0.88 (-0.77 to -1.04) Pg C yr-1 to a new relatively constant mean of -1.15 Pg C yr-1 between 1989 and 2003/7 (the sign convention is negative out of the atmosphere). This result is detectable at the 99% level using a t-test. The land use source (LU) is relatively constant over this entire time interval. While the LU estimate is highly uncertain, this does imply that most of the change in the net land carbon sink must be due to an abrupt increase in the land sink, LS Combining double low line NLS - LU, in response to some as yet unknown combination of biogeochemical and climate forcing. A regional synthesis and assessment of the land carbon sources and sinks over the post 1988/1989 period reveals broad agreement that the Northern Hemisphere land is a major sink of atmospheric CO2, but there remain major discrepancies with regard to the sign and magnitude of the net flux to and from tropical land.

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Sarmiento JL, Gloor M, Gruber N, Beaulieu C, Jacobson AR, Fletcher SEM et al. Trends and regional distributions of land and ocean carbon sinks. Biogeosciences. 2010 Aug 18;7(8):2351-2367. https://doi.org/10.5194/bg-7-2351-2010